Lever-harrow.



H. HECHT.

LEVER HAnnow.

APPLIUATION FILED DBO. 21,1909. 970,921 Patented Sept. 20,1910.

2 SHEETS-SHEET 1.

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H. HEGHT.

LEVER HARROW. APPLIoATIoN FILED :1110.21.1900.

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HENRY I-IECI-IT,`OF JACKSON, MINNESOTA.

LEVER-HARROW.

Specification of Letters Patent.

Patented Sept. 20, 1910.

Application led December 21, 1909. Serial No. 534,285.

. Harrows, of which the following is a speciication.

This invention relates to spiked tooth harrows of that class which aregenerally known as lever harrows and which are equipped with meanswhereby the spikecarrying bars may be oscillated upon their axes topresent the teeth in a tilted position t various inclinations to thesurface of the A prime object of the present invention is to construct aharrow of the character described, wherein the oscillatory spikecarryingbar shall be capable of rocking movement independent of the adjustingmovement, such rocking movement being resisted by the action of suitablesprings, thus enabling the tooth-carrying bars to yield to suchobstructions as may be encountered without danger of breakage and to beimmediately restored to active position.

A further object of the invention is to provide a device of thecharacter described of simple and improved construction in which thetension of the springs resisting the rockin movement of thetooth-carrying bars may e adjusted in a simple and convenient manner.

Still further objects of the invention are to simplify and improve thegeneral construction and operation of a device of the character outlinedabove.

With these and other ends in view which will readily appear as thenature of the invention is better understood, the same consists in theimproved construction and novel arrangement and combination of partswhich will be hereinafter fully described and particularly pointed outin the claim.

In the accompanying drawings has been illustrated a simple and preferredform of the invention, it being, however, understood that no limitationis necessarily made to the recise structural details therein exhibited,but that changes, alterations and modifications within the scope of theinvention may be resorted to when desired.

In the drawings,-Figure 1 is a top plan view of a harrow constructed inaccordance with the invention. Fig. 2 is a longitudinal sectional viewtaken on the lane indicated by the line 2-2 in Fig. 1. T ig. 3 is a rearelevation. Fig. 4 is a sectional detail view enlarged, taken through aportion of one of the tooth-carrying bars and the lower part of theadjusting lever and related parts. Fig. 5 is a sectional detail view ofa portion of one of the tooth-carrying bars, showing one of the teeth.Fig. G is a sectional detail view taken on the plane indicated by theline (3 6 in Fig. 4.

Corresponding parts in the several figures are denoted by likecharacters of reference.

The frame of the improved harrow is composed of side members 7 connectedadjacent to their front ends by a cross bar 8 to which draft may beapplied in any suitable, convenient and well known manner. The sidemembers 7 afford bearings for the oscillatory tooth-carrying bars 9,which in the example illustrated in the drawings have been shown asconsisting of tubular bars provided at intervals with slots or aperturesin which teeth or spikes 10 are mounted and secured by means offastening nuts l1. The side members 7 of the frame are additionallyconnected by means of suitable brace members 12, as will be best seen inFig. 1 of the drawings.

Each of the tooth-carrying bars is equipped with a lever arm 15 having ahub 16, whereby it is mounted upon the bar, said hub being provided witha slot 17 for the accommodation of a pin or bolt 18 extendingtransversely through the tooth-carrying bar 9 upon which the hub ismounted, one end of the slot 17 constituting a shoulder 19 upon whichthe upper end of the pin or bolt 18 abuts to obstruct the oscillation ofthe toothcarrying bar in one direction. Oscillation of thetoothecarrying bar in the opposite direction is resisted by the actionof a spring 2O coiled upon the bar 9, one end of said spring beingconnected with the hub 16 by means of a lug or stud 21, while theopposite end of said coiled spring is securely connected with one end ofa collar 22 loosely supportedu on i the bar 9 and having at one end aratc iet face 23 engaging a pin or plug 24 that extends diametricatllythrough the tooth-carrying bar 9. The collar 22 is provided with aerably the rearmost one, is provided with an upward extension forming ahandle 26, and

the several arms 15 are connected by a longitudinally disposed link 27having a rack segment 28 adapted to be engaged by a springactuated stopmember 29 carried by the extension handle 26 of the lever arm 1,5. Fromthe foregoing description, taken in ,q 'connection with the drawingshereto anlo yneXed, the operation and advantages of this invention willbe readily understood by those skilledin the art to which itappert-ains. It obvious that lwhen the stop 29 is in en- .gagement withthe rack segment 2S, the @parts are securely locked together topreve-ntloscillation of the tooth-carrying bars 1, @under'ordinarycircumstances, and it is fur p' fthe'r obvious that by properlymanipulating y the handle member 26, the tooth-carrying f ybars `may beoscillated to present the teeth "vertically or at various inclinationswith i 'reference to the surface of the ground. This 'isldueto the factthat a connection is esftablished between the lever arms 15 and the y'"25 too'tlrcarrying bars 9 by the springs 20, the

tension ofr which is exerted to oscillate the rock bars in one directionuntil the upper endsof the pins or bolts 18 are supported `upon theshoulders 19 of the hubs 16 of the lever arms. When the device is inuse,

however, if any obstruction should be encountered by any of the teeth,the bar carrying such tooth will be rocked against the tension o-f thespring, thus permitting the tooth to pass over the obstruction, afterwhich the tooth-carrying bar will be restored evdzi to normal positionby the tension of the spring.

The improved harrow is particularly useful not only in fields whichvcontain numerous obstructions in the form of stones, stalks or thelike, but it is found extremely useful in harrowing fields unencumberedwith straw, corn stalks or the like, since such obstructions will bepassed without being raked into large piles which then require to bedischarged from or disengaged from the machine when a harrow of ordinaryconstruction is used. It is obvious that the tension of the springs 20may be very readily adjusted to suit varying circumstances. p

Having thus described the invention, what is claimed as new, is

A harrow frame, a tooth-carrying rock bar supported therein, a lever armhaving a slotted hub engaging the rock bar, a stop member extendingthrough the rock bar and abutting at its upper end upon the shoulder atone end of the slot in the hub, a collar supported loosely upon the rockbar, a spring coiled upon the bar and connected at its ends with thecollar and with the hub of the lever arm, and means for securing thecollar in various positions with relation to the rock bar to regulatethe tension of the spring.

In testimony whereof I atlix my signature in vpresence of twowitnesses.`

HENRY HE CHT.

fitnesses ASHER O. NASLEY, 7. L. HUNTER.

